Effect of carvacrol in the properties of films based on poly (vinyl alcohol) with different molecular characteristics

Andrade, João Sousa; González‐Martínez, Chelo; Chiralt, Amparo

doi:10.1016/j.polymdegradstab.2020.109282

Cited by 17 publications

(7 citation statements)

References 45 publications

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“…It could be observed that the characteristic peaks of the film samples appeared at 3307 cm −1 (N–H stretching vibration), 2934 cm − 1 (C–H stretching vibration), 1652 cm −1 (C=C stretching vibration), 1558 cm −1 (N=O stretching vibration) and 1039 cm −1 (C–O stretching vibration). The spectrum was similar to previous reports (Andrade, Gonzalez‐Martinez, & Chiralt, 2020). Furthermore, the effect of the incorporation with different concentrations of CA on the FTIR spectra of the film was demonstrated in Figure 5.…”

Section: Resultssupporting

confidence: 91%

Effect of carvacrol on properties and release behavior of gelatin‐egg white protein/polyethylene bilayer film

Cao

Zhang

Wang

et al. 2021

J Food Process Engineering

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A bilayer antibacterial film of gelatin (G)—egg white protein (EW) containing carvacrol (CA) on polyethylene (PE) was prepared. This study investigated the effects of different concentrations of CA on the apparent viscosity and particle size of gelatin and egg white protein composite film‐forming solution (FFS). The static rheological results showed that the viscosity of FFS increased significantly in the presence of CA. The results of particle size showed that FFS had good stability. Fourier transform infrared (FTIR) spectroscopy indicated that there were hydrogen bond interactions among G/EW and CA with good compatibility. Scanning electron microscopy (SEM) indicated that the incorporation of CA made the film surface structure denser. The film with CA had good antioxidant and antibacterial activities. Under the same conditions, the higher the CA content, the higher the release rate, and the release rate was positively correlated with the increase in temperature and ethanol content in the food simulant, which indicated that the bilayer antibacterial film containing CA could be used for packaging high‐fat foods. Therefore, the G/EW‐PE bilayer antibacterial film containing CA could make up for the poor water resistance of the edible monolayer film, and gave the antibacterial function that the polyethylene packaging film did not have. Practical Applications CA has safe and efficient antibacterial activity. It is listed by the Food and Drug Administration (FDA) in the list of additives that can be directly added to food for human consumption. Compared with the traditional single‐layer packaging film (plastic film and edible packaging film), the G/EW‐PE bilayer film containing CA can not only make up for the poor water resistance of the edible single‐layer film, but also give the plastic film new packaging performance. This study characterized the microstructure, physical properties, antibacterial properties and the release of CA in the film, which provided theoretical reference for the development of food packaging.

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Section: Resultssupporting

confidence: 91%

Effect of carvacrol on properties and release behavior of gelatin‐egg white protein/polyethylene bilayer film

Cao

Zhang

Wang

et al. 2021

J Food Process Engineering

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“…With increasing amounts of CLO in the blended structures, 23.30% and 25.08% weight remained with 1% or 10% CLO; while with matrices containing CO, 18.50% and 29.01% weight also endured after afflicted thermal variations. This phenomenon could be ascribed to the increased plasticizing effect of EOs with a rising temperature, which enhances the free volume of the chains, promotes molecular mobility, and consequently hinders the intermolecular polymer interactions and polymer–polymer interactions in the overall film network [ 67 , 68 ]. Films incorporated with CLO showed lower weight loss compared to those containing CO, possibly revealing stronger interactions between CS, PVA, and CLO, as also observed by Xu et al [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Eugenol-Containing Essential Oils Loaded onto Chitosan/Polyvinyl Alcohol Blended Films and Their Ability to Eradicate Staphylococcus aureus or Pseudomonas aeruginosa from Infected Microenvironments

et al. 2021

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Chronic wounds (CW) create numerous entryways for pathogen invasion and prosperity, further damaging host tissue and hindering its remodeling and repair. Essential oils (EOs) exert quick and efficient antimicrobial (AM) action, unlikely to induce bacterial resistance. Cinnamon leaf and clove oils (CLO and CO) display strong AM activity, namely against Staphylococcus aureus and Pseudomonas aeruginosa. Chitosan (CS) is a natural and biodegradable cationic polysaccharide, also widely known for its AM features. CS and poly (vinyl alcohol) (PVA) films were prepared (ratio 30/70 w/w; 9 wt%) by the solvent casting and phase inversion method. The film’s thermal stability and chemical composition data reinforced polymer blending and EO entrapment. Films were supplemented with 1 and 10 wt% of EO in relation to total polymeric mass. The film thickness and degree of swelling (DS) tended to increase with EO content, particularly with 10 wt % CLO (* p < 0.05). UV-visible absorbance scans in the 250–320 cm−1 region confirmed the successful uptake of CLO and CO into CS/PVA films, particularly with films loaded with 10 wt% EO that contained 5.30/5.32 times more CLO/CO than films supplemented with 1 wt% EO. AM testing revealed that CS films alone were effective against both bacteria and capable of eradicating all P. aeruginosa within the hour (*** p < 0.001). Still, loaded CS/PVA films showed significantly improved AM traits in relation to unloaded films within 2 h of contact. This study is a first proof of concept that CLO and CO can be dispersed into CS/PVA films and show bactericidal effects, particularly against S. aureus, this way paving the way for efficient CW therapeutics.

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“…The thermal properties of the films were affected by the incorporation of glycerol in the polymeric matrix, which produces significantly lower Tg and Tm values than those reported for non-plasticised films, (Tg: 56ºC, Tm: 168ºC). This effect is coherent with the plasticising effect of glycerol in the amorphous fraction and the formation of smaller crystals, due to the interference of glycerol in the crystallisation of the polymer (Andrade et al, 2020a). In general, the processing method did not generate significant effects on the melting behaviour of the materials.…”

Section: Thermal Behaviourmentioning

confidence: 68%

Effect of phenolic acids on the properties of films from Poly (vinyl alcohol) of different molecular characteristics

Andrade

González‐Martínez

Chiralt

2021

Food Packaging and Shelf Life

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Effect of carvacrol in the properties of films based on poly (vinyl alcohol) with different molecular characteristics

Cited by 17 publications

References 45 publications

Effect of carvacrol on properties and release behavior of gelatin‐egg white protein/polyethylene bilayer film

Effect of carvacrol on properties and release behavior of gelatin‐egg white protein/polyethylene bilayer film

Eugenol-Containing Essential Oils Loaded onto Chitosan/Polyvinyl Alcohol Blended Films and Their Ability to Eradicate Staphylococcus aureus or Pseudomonas aeruginosa from Infected Microenvironments

Effect of phenolic acids on the properties of films from Poly (vinyl alcohol) of different molecular characteristics

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